QbsProject: Make initial CppTools::ProjectInfo valid

This fixes triggering the QTC_ASSERT in updateCppCompilerCallData() if
the user opens and builds the following qbs project:

    import qbs
    Product {}

Conceptually the initial ProjectInfo should stay invalid, but this would
result in a bigger / more risky change. Will be addressed in master
properly.

Change-Id: I74d3374b438884f38947f551915a80ec836a85c1
Reviewed-by: Christian Kandeler <christian.kandeler@theqtcompany.com>

src/plugins/qbsprojectmanager/qbsproject.cpp

@@ -110,6 +110,7 @@ QbsProject::QbsProject(QbsManager *manager, const QString &fileName) :
     m_qbsUpdateFutureInterface(0),
     m_parsingScheduled(false),
     m_cancelStatus(CancelStatusNone),
+    m_codeModelProjectInfo(this),
     m_currentBc(0)
 {
     m_parsingDelay.setInterval(1000); // delay parsing by 1s.